2-alkylcyclobutanones have been successfully used as chemical markers for irradiated foods. Unfortunately, most sample preparation, and isolation methods for these markers from their food matrices involve a long and very tedious clean-up regimen prior to analysis. A simple and rapid method for the isolation of these markers using carbon dioxide as a supercritical fluid is described for beef and chicken samples irradiated up to 8 kGy. Significant levels of both 2-dodecylcyclobutanone (2-DCB) and 2-tetradecylcyclobutanone (2-TCB) were extracted from all irradiated samples using carbon dioxide as a supercritical fluid, the method is proposed as an alternative to the florisil chromatography method currently in use.

Is Africa facing a nutrition transition under the double burden of disease?Tewfik, I., Bener, A. and Tewfik, S. 2010. Is Africa facing a nutrition transition under the double burden of disease? in: Ahmed, A. and Nwankwo, S. (ed.) Achieving sustainable development in Africa: science, technology & innovation trajectory London World Association for Sustainable Development (WASD).

Nutritional quality of deep fried street-vended foods: a public health concernTewfik, I., Ismail, H. and Tewfik, S. 2009. Nutritional quality of deep fried street-vended foods: a public health concern. in: Ahmed, A. (ed.) World sustainable development outlook: the impact of the global financial crisis on the environment, energy and sustainable development 2009 London World Association for Sustainable Development (WASD).